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A security vulnerability in a Defense Manpower Data Center file-sharing system allowed unauthorized users to access files containing unencrypted personal information, according to a breach notification reviewed by Military Times. DMDC manages critical identity and personnel data tied to the military community. The affected files may include Social Security numbers plus names, dates of birth, contact details, demographic information, and military personnel data such as occupational specialty. The reported access window ran from October 2025 until July 16, 2026, when the vulnerability was discovered. The exact number affected has not been publicly confirmed, but sources familiar with the incident estimated about four million Defense Department personnel may be involved. If you receive an official notice, use the credit-monitoring service offered, consider a credit freeze, review financial accounts, and be skeptical of phishing messages that use military details to sound real. #databreach #miltok #veterans #military #data